The Power of Napping: How Daytime Sleep Can Protect Your Brain and Improve Your Health

What if one of the simplest things you could do for your brain involved closing your eyes for 20 minutes in the middle of the afternoon?

For years, napping has been associated with laziness, poor motivation, or not getting enough sleep the night before. In a culture that celebrates productivity, taking a break to sleep can almost feel like cheating. But your brain may see things differently.

Research suggests that a well-timed nap can improve alertness, strengthen certain types of memory, support learning, and even create the conditions for a sudden creative breakthrough. A remarkable study published in 2023 raised an even more intriguing possibility: people genetically predisposed to habitual daytime napping may have larger brains as they age.

That doesn’t mean a nap can magically turn back the clock. But it does suggest that daytime sleep deserves more respect than it usually receives.

The Remarkable Study Linking Napping to a Younger-Looking Brain

In 2023, researchers published a study in Sleep Health examining the relationship between habitual daytime napping and brain health using genetic information from the UK Biobank. The analysis included data from as many as 378,932 participants, with an average age of approximately 57 years.

Rather than simply comparing people who nap with those who don’t, researchers used a method called Mendelian randomization. This approach examines genetic variants associated with a particular behavior—in this case, habitual napping—to investigate whether that behavior might contribute to an observed health difference. Researchers identified 92 genetic variants associated with daytime napping and examined their relationship with brain structure and cognitive performance.

Their most interesting finding involved total brain volume. People with a genetic predisposition toward habitual napping had, on average, approximately 15.8 cubic centimeters greater total brain volume. The researchers estimated that this difference was comparable to roughly 2.6 to 6.5 years of typical age-related brain-volume change.

As we age, the brain gradually loses volume. This process is influenced by many factors, including vascular health, inflammation, metabolic health, and normal biological aging. Because preserving brain structure is an important part of healthy aging research, the finding attracted considerable attention.

However, the study did not demonstrate that napping actually makes the brain younger or prevents dementia. Researchers also found no convincing benefit for hippocampal volume, reaction time, or visual memory in this genetic analysis. What the study provides is an intriguing reason to investigate whether habitual daytime sleep might contribute to maintaining brain structure over time.

Dr. Scott’s Insight: We often think about brain health in terms of nutrition, exercise, and supplements, but sleep deserves an equally important place in that conversation. The brain is a living, adaptive organ, and the quality of its recovery environment may influence how well it functions throughout life.

Your Brain Doesn’t Stop Working When You Fall Asleep

One of the most fascinating discoveries in sleep science is that sleep is not simply a period when the brain switches off. During waking hours, your brain is constantly processing information, responding to your environment, making decisions, and forming new memories. Sleep provides an opportunity for the nervous system to reorganize some of that activity and strengthen what it has learned.

Imagine spending the morning studying something new, practicing a skill, or trying to understand a complicated idea. Even after you stop concentrating on it, your brain continues processing that information. During sleep, certain memories become more stable and easier to retrieve, a process scientists call memory consolidation.

A 2022 systematic review and meta-analysis examined 54 studies involving 60 samples to determine whether afternoon naps improve cognitive performance. The researchers found small-to-moderate improvements across several cognitive measures, including declarative memory, procedural memory, vigilance, and processing speed.

Declarative memory involves remembering facts and events, while procedural memory helps us retain learned skills and movements. In practical terms, a nap may help someone remember information they’ve studied, maintain attention during a demanding afternoon, or perform a recently learned task more effectively.

These benefits are especially interesting because they have been demonstrated in studies that measure actual cognitive performance. Although we cannot yet say that naps prevent long-term cognitive decline, there is meaningful evidence that they can help the brain function more effectively in the hours following sleep.

Can a Nap Make You More Creative? Salvador Dalí Thought So

The Spanish surrealist artist Salvador Dalí reportedly used an unusual technique to capture ideas from the boundary between waking and sleeping. He would sit in a chair holding a key above a plate. As he began drifting into sleep, his muscles would relax, the key would fall, and the noise would wake him. The goal was to interrupt sleep just as dreamlike images and unexpected associations were beginning to appear.

It sounds eccentric, but modern research suggests there may be something interesting about that transitional state.

In a 2021 study published in Science Advances, researchers investigated creativity during the earliest stage of non-REM sleep, known as N1. Participants worked on a mathematical task containing a hidden shortcut. After a rest period, researchers examined whether entering this earliest stage of sleep increased the likelihood of discovering the shortcut.

The results were remarkable. Among participants who entered N1 sleep without progressing into deeper sleep, approximately 83% discovered the hidden rule, compared with approximately 31% of participants who remained awake. Interestingly, the advantage was not observed in participants who progressed into deeper sleep.

This doesn’t mean that every micro-nap will make someone more creative, or that a few seconds of sleep can replace thoughtful work. The experiment measured a particular type of problem-solving insight under controlled conditions. Nevertheless, it suggests that the transition between wakefulness and sleep may create an unusual opportunity for the brain to form connections that are less obvious during focused waking thought.

Sometimes the best way to solve a problem may be to stop trying so hard to solve it.

Could Napping Also Support Heart Health and Stress Recovery?

The relationship between napping and cardiovascular health is more complicated than its relationship with short-term alertness and memory. Some studies suggest benefits, while others have found associations between longer or more frequent naps and poorer health outcomes.

A 2019 study published in Heart followed 3,462 adults in Switzerland for an average of approximately 5.3 years. Researchers found that people who reported napping once or twice per week had a lower rate of cardiovascular events than those who did not nap. After statistical adjustments, the association represented approximately 48% lower observed risk during follow-up.

That finding is encouraging, but it doesn’t prove that napping prevented heart disease. People who nap may differ in their stress levels, work schedules, nighttime sleep, overall health, and lifestyle habits. These differences can influence cardiovascular risk independently of napping.

Other research has been less reassuring. A 2024 meta-analysis of cohort studies found that naps lasting 30 minutes or longer were associated with higher risks of certain adverse health outcomes, while shorter naps did not show the same statistically significant associations. Researchers have suggested that long daytime naps may sometimes reflect inadequate nighttime sleep, underlying illness, or excessive daytime sleepiness rather than causing those problems.

A brief nap can also provide a welcome break from mental demands, and some small studies have explored how daytime sleep affects physiological stress responses. However, the evidence is not strong enough to conclude that regular napping reliably lowers cortisol, blood pressure, or cardiovascular risk.

The practical message is that a short, refreshing nap may be a useful part of a healthy lifestyle, but it should not be viewed as a substitute for exercise, good nutrition, adequate nighttime sleep, or appropriate medical care.

Were Humans Really Designed to Sleep Only Once a Day?

Most adults today follow a monophasic sleep schedule, meaning they sleep once during a 24-hour period, usually at night. This pattern fits modern work schedules and is perfectly healthy for many people, but it is not the only way humans have organized their sleep.

In many cultures, biphasic sleep has been common, with a longer period of nighttime sleep and a shorter rest or nap during the afternoon. The traditional siesta is a familiar example. For someone who already sleeps adequately at night, a brief afternoon nap may complement this pattern without significantly interfering with nighttime rest.

Polyphasic sleep involves several periods of sleep spread throughout the day and night. Infants naturally follow this pattern, and adults working unusual schedules may sometimes sleep in multiple episodes. However, highly restrictive polyphasic schedules promoted as ways to function on only a few hours of sleep have not been shown to provide the same health benefits as adequate total sleep. Multiple short naps should not be assumed to replace a full night’s rest.

There is also an interesting historical perspective. Historian A. Roger Ekirch documented accounts of people experiencing a first sleep, waking for a period during the night, and then returning for a second sleep. During that waking interval, people sometimes engaged in quiet activities, conversation, or reflection. Historians continue to debate how widespread this pattern actually was, but the accounts remind us that sleep habits have varied across time and cultures.

The important lesson is not that everyone should adopt a different sleep schedule. Rather, human sleep behavior has some flexibility, and a brief daytime nap is not necessarily evidence that something is wrong with your nighttime sleep.

How Long Should You Nap? The Science of Timing

The ideal nap depends on what you hope to accomplish. A short nap before an afternoon meeting serves a different purpose than a longer recovery nap after significant sleep loss. For most adults who follow a conventional daytime schedule, however, 10 to 20 minutes is a practical starting point.

Short naps can improve alertness while reducing the likelihood of waking from deeper stages of sleep. Longer naps may provide additional opportunities for memory processing and recovery, but they also increase the chance of experiencing sleep inertia—the temporary grogginess, sluggish thinking, or disorientation that sometimes follows awakening.

This explains why you can occasionally wake from a long afternoon nap feeling worse than when you lay down. Your brain may still be transitioning from deeper sleep back into full alertness.

A Practical Guide to Nap Length

Nap Duration	Potential Benefits	What to Consider
5–10 minutes	Brief rest and possible alertness benefits	May be too short for some people
10–20 minutes	Alertness, attention, and mental refreshment	A practical starting point
20–30 minutes	Cognitive recovery and some memory benefits	Some people experience grogginess
30–60 minutes	More sleep and potential memory processing	Greater possibility of sleep inertia
Approximately 90 minutes	May allow progression through several sleep stages	Requires more time and may affect nighttime sleep

For people who wake in the morning and sleep at night, the early afternoon is often the most convenient time to nap. Many people experience a natural decline in alertness during this part of the day because of circadian timing and the gradual accumulation of sleep pressure.

A practical window is approximately 1:00 to 3:00 p.m., although individual schedules vary. Napping too late in the afternoon can reduce the sleep pressure that helps you fall asleep at night. If you already struggle with insomnia, shortening or eliminating daytime naps may be more helpful than adding them.

Dr. Scott’s Tips: How to Make Napping Work for You

The goal is not to force yourself to sleep every afternoon. It’s to recognize when a brief period of rest might help your brain and body function better. For many people, a little experimentation is all it takes to discover whether napping is beneficial.

Start with 15–20 minutes. Set an alarm and observe how you feel afterward. Some people fall asleep quickly, while others need several minutes to relax. Adjust your resting time based on your experience rather than following a rigid formula.

Choose the early afternoon. Try scheduling your nap before 3:00 p.m., especially if you normally go to bed between 9:00 and 11:00 p.m. A late nap may interfere with your ability to fall asleep that evening.

Create a comfortable environment. Dim lighting, a quiet room, and a comfortable temperature can make it easier to relax. You don’t need a perfect sleeping environment, but reducing distractions can improve the experience.

Give yourself time to wake up. If you feel groggy afterward, get up, move around, and expose yourself to natural daylight. Avoid driving or performing safety-sensitive activities until you feel fully alert.

Protect nighttime sleep first. A nap should complement adequate nighttime rest rather than become a routine substitute for it. Most adults still need approximately seven to nine hours of sleep per night.

Pay attention to unusual daytime sleepiness. If you suddenly need long naps every day, regularly fall asleep unintentionally, or wake feeling exhausted despite adequate time in bed, consider whether an underlying sleep or health problem needs evaluation.

The most useful napping routine is the one that helps you feel better during the day without compromising the quality of your sleep at night.

When Daytime Fatigue May Be Telling You Something More

There is an important difference between choosing to nap because it helps you feel refreshed and feeling unable to stay awake throughout the day. Persistent fatigue or excessive daytime sleepiness can sometimes be associated with sleep apnea, insufficient nighttime sleep, medication effects, thyroid dysfunction, mood disorders, or other health conditions.

From a functional-medicine perspective, it is worth asking why the body is struggling to maintain energy rather than simply assuming another cup of coffee is the solution. Sleep quality is connected to metabolic health, hormone regulation, stress physiology, and many other systems that influence how we feel and function.

At Total Health Center, we consider sleep quality alongside nutrition, metabolic health, stress, and other factors that may contribute to a patient’s overall energy and well-being. You can learn more about our functional medicine approach and what to expect during your first functional medicine visit.

The Takeaway: Sometimes Rest Is the Productive Choice

For many people, a nap is something to feel guilty about. But the research tells a more interesting story.

Short naps can improve certain aspects of memory, alertness, and cognitive performance. The earliest stages of sleep may even create an unusual opportunity for creative insight. Emerging genetic research also raises fascinating questions about the relationship between habitual napping and the physical structure of the aging brain.

We still have much to learn, particularly about whether naps can protect long-term brain health or cardiovascular function. But we already know enough to reconsider the idea that every moment of rest is wasted time.

Sometimes the most productive thing you can do for your brain is give it permission to rest.

Key Takeaways

• Short daytime naps can improve alertness and certain types of memory and learning.
• A 2023 genetic study associated habitual napping with approximately 15.8 cm³ greater total brain volume, comparable to several years of age-related brain-volume differences. It did not prove that naps reverse brain aging.
• Research on early sleep stages suggests a potential benefit for creative problem-solving.
• Evidence concerning napping and cardiovascular health is mixed, and naps are not a proven method of preventing heart disease.
• A 10–20-minute early-afternoon nap is a practical starting point for many adults.
• Persistent excessive daytime sleepiness deserves investigation rather than simply adding longer naps.

About Dr. Mark Scott

Dr. Mark Scott is a functional-medicine practitioner and chiropractor at Total Health Center in Virginia Beach, Virginia. With nearly three decades of experience in functional medicine, he helps patients explore how nutrition, metabolism, sleep, lifestyle, and other physiological factors may contribute to their health concerns.

His approach emphasizes understanding the factors influencing health and developing individualized strategies that support better function and long-term well-being.

Free Consultation

If you’re struggling with persistent fatigue, poor sleep, brain fog, or unexplained changes in energy, it may be time to look more closely at the factors influencing your health.

Total Health Center offers a Free Consultation to discuss your concerns and determine whether our functional-medicine approach may be appropriate for you.

Learn More About Functional Medicine at Total Health Center

References

The following research references can be placed at the end of the article, after the Frequently Asked Questions.

1. Paz V, et al. (2023). Is there an association between daytime napping, cognitive function, and brain volume? A Mendelian randomization study in the UK Biobank. Sleep Health. Research linking habitual daytime napping with greater total brain volume, corresponding to approximately 2.6–6.5 years of age-related brain-volume differences. Read the study

2. Souabni M, et al. (2022). Benefits of napping and an optimal nap duration. Systematic review and meta-analysis examining the effects of daytime napping on memory, alertness, and cognitive performance. View research on PubMed

3. Lacaux C, et al. (2021). Sleep onset is a creative sweet spot. Science Advances. Research demonstrating that the transition between wakefulness and sleep may enhance creative problem-solving and insight. Read the study

4. Häusler N, et al. (2019). Association of napping with incident cardiovascular events in a prospective cohort study. Heart. Study of 3,462 adults examining the relationship between nap frequency and cardiovascular events. Read the study

5. To nap or not? (2024). Evidence from a meta-analysis of cohort studies of habitual daytime napping and health outcomes. Research examining associations between nap duration and health risks, including potentially unfavorable associations with longer naps. View research on PubMed

6. Centers for Disease Control and Prevention (CDC/NIOSH). Napping, Nap Duration and Sleep Inertia. Guidance on effective nap duration, post-nap grogginess, and practical strategies for maintaining alertness. Read CDC guidance

7. Boyce N. (2023). Have we lost sleep? A reconsideration of segmented sleep in early modern England. Medical History. Historical analysis questioning how widespread segmented nighttime sleep was in preindustrial societies. Read the study

8. Ekirch AR. (2024). Reflections on “Have we lost sleep?” Medical History. Historical discussion of first and second sleep patterns and their prevalence in earlier societies. Read the article

Frequently Asked Questions

Is a 20-minute nap good for your brain?

A short nap of approximately 20 minutes can improve alertness and attention and may support certain aspects of cognitive performance. The exact benefit depends on the individual, prior sleep, and nap timing.

Can napping prevent dementia?

There is currently insufficient evidence to conclude that napping prevents dementia. The 2023 genetic study found an association with larger total brain volume, but did not establish dementia prevention.

Why do I feel tired after a long nap?

You may be experiencing sleep inertia, particularly if you awaken from deeper sleep. This temporary grogginess can affect attention, reaction time, and mental clarity.

Is it healthy to nap every day?

Daily napping can be reasonable for some people, particularly when naps are brief and nighttime sleep remains adequate. However, a new or excessive need for daytime sleep may signal an underlying issue.

Is a 90-minute nap better than a 20-minute nap?

Not necessarily. A longer nap may provide more sleep and recovery after sleep loss, but it takes more time and can interfere with nighttime sleep. A brief nap is often more practical for daytime alertness.

What is the best time to take a nap?

For many adults with a conventional daytime schedule, early afternoon—often around 1:00 to 3:00 p.m.—is a useful window. Individual schedules and sleep needs vary.